US10170965B2 - Linear vibration motor - Google Patents

Linear vibration motor Download PDF

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Publication number
US10170965B2
US10170965B2 US15/236,669 US201615236669A US10170965B2 US 10170965 B2 US10170965 B2 US 10170965B2 US 201615236669 A US201615236669 A US 201615236669A US 10170965 B2 US10170965 B2 US 10170965B2
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United States
Prior art keywords
vibrator
housing
vibration motor
weight
linear vibration
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Expired - Fee Related, expires
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US15/236,669
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English (en)
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US20170110947A1 (en
Inventor
Lubin Mao
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AAC Technologies Pte Ltd
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AAC Technologies Pte Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K33/00—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system
    • H02K33/16—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system with polarised armatures moving in alternate directions by reversal or energisation of a single coil system
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K33/00—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
    • H02K7/12—Structural association with clutches, brakes, gears, pulleys or mechanical starters with auxiliary limited movement of stators, rotors or core parts, e.g. rotors axially movable for the purpose of clutching or braking

Definitions

  • the present disclosure is related to vibration motors, specifically related to a vibration motor for portable consumer electronic products.
  • a related linear vibration motor 1 as shown in FIG. 1 comprises a housing 11 having an accommodation space, an elastic support 13 connecting with the housing 11 , a vibrator 15 suspended in the accommodation space by using the elastic support 13 and composed of a weight 151 and a permanent magnet 153 , and coils facing the permanent magnet 153 ; the coils are accommodated in the housing 11 , arranged opposite to the permanent magnet 153 with interval and positioned between the permanent magnet 153 and bottom wall of the housing 11 ; the end of the elastic support 13 is fixed on the housing 11 in order to support the reciprocating motion of the vibrator 15 along the horizontal direction during working.
  • FIG. 2 is a cross-sectional view of a linear vibration motor in accordance with an exemplary embodiment of the present disclosure.
  • FIG. 4 is a broken view of the linear vibration motor in FIG. 3 .
  • the housing 27 comprises a housing body 271 having an opening on one end and a cover plate 273 which is connected with the opening end of the housing body 271 ; the elastic part 25 , the vibrator 21 and the springs 23 are accommodated in the accommodation space of the housing 27 .
  • the vibrator 21 comprises a weight 211 , a permanent magnet 213 and a pole piece 217 ; the permanent magnet 213 runs through the weight 211 ; coils 215 are arranged opposite to the permanent magnet 213 with interval and positioned between the weight 211 and the housing body 271 ; the coils 213 are fixed on the inner wall of the housing 271 ; and the surface of the weight 211 far from one side of the coil 215 is covered by using the pole piece 217 .
  • the weight 211 comprises a connecting block 2111 , a first weight 2113 and a second weight 2115 extending along two ends of the connecting block 2111 in different directions.
  • the first weight 2113 and the second weight 2115 are arranged symmetrically and form flutes 2117 arranged symmetrically with the connecting block 2111 .
  • the springs 23 are accommodated in said flutes 2117 , respectively.
  • the coils 215 and the permanent magnet 213 are arranged oppositely to each other.
  • the coils 215 are the flat coils, arranged between the permanent magnet 213 and the housing body 271 and fixed on the inner wall of the housing body 271 .
  • the directions of polarization of the poles of the permanent magnet 213 facing the coils 215 are opposite to each other.
  • the pole piece 217 is presented as a plane, covers the surface of the weight 211 far from one side of the coil 215 and is positioned between the weight 211 and the cover plate 273 .
  • the pole piece 217 is taken to prevent the permanent magnet 213 from magnetic flux leakage; therefore, more excellent electro-magnetic induction effect can be generated.
  • the springs are spiral springs symmetrically arranged in pairs, and the spiral springs have certain pre-loaded pressures after being subjected to pre-compression and are installed in the flutes 2117 symmetrically.
  • One end of the spring 23 is connected with the vibrator, and the other end thereof is connected with the housing body 271 .
  • the spring 23 is vertical to the vibration direction of the vibrator 21 .
  • one pair of springs 23 are arranged, and the each of the springs 23 is accommodated in corresponding flutes 2117 after pre-compression, respectively.
  • the central line of two springs 23 is positioned on the identical straight line and vertical to the vibration direction of the vibrator 21 .
  • two pairs or multiple pairs of springs 23 shall be allowable, rather than one pair only.
  • Each of the springs 23 can be installed in corresponding and independent flute 2117 respectively when two pair or multiple pairs of springs are available in order to avoid collision of the springs on identical side, or multiple springs on identical side can also be installed in identical flute 2117 abreast with certain interval.
  • the elastic parts are arranged on two ends of the weight 211 along direction X, therefore the vibrator 21 can be suspended in the accommodation space of the housing body 271 .
  • the elastic part 25 comprises a fixation part 251 connecting with the vibrator 21 , a connecting part 255 connecting with the housing 271 and a bending part 253 connecting the connecting part 255 with the fixation part 251 .
  • the bending part 253 extends along the fixation part 251 in zigzag form and is connected with the connecting part 255 . Therefore, each elastic part 25 is presented as the U-shaped structure approximately with opening facing the vibrator 21 .
  • multiple barrier sheets 257 are also arranged on the elastic part 25 .
  • the fixation part 251 comprises a third surface connecting with the vibrator 21 and a fourth surface opposite to the third surface, wherein the fourth surface faces the housing body 271 .
  • the connecting part 255 comprises a first surface facing the vibrator 21 and a second surface opposite to the first surface.
  • the second surface is connected with the housing body 271 .
  • the connecting part 255 of the elastic part 25 and the housing body 271 are welded together by using laser spot welding.
  • the second surface of the connecting part 255 of the elastic part 25 is welded with the housing body 271 by using the laser spot welding.
  • the third surface of the fixation part 251 of the elastic part 25 is welded with the first weight 2113 by using laser spot welding.
  • the barrier sheets 257 are arranged on the first surface and the fourth surface, respectively. Moreover, the barrier sheets 257 can be any one of square, round and other shapes applicable.
  • the theorem for implementing stable motion of the linear vibration motor 2 provided in the invention is as follows:
  • spiral springs 23 Two of said spiral springs 23 are assembled on two opposite sides of the weight 211 , wherein the spiral springs 23 have certain pre-compression amounts after being subjected to compression, that is, the spiral springs 23 on the balanced positions have the pre-loaded pressure.
  • Certain component forces of the pre-loaded pressure of the spiral spring 23 shall exist in the directions X and Y when the vibrator 21 vibrates along the direction X, wherein the component forces of the spiral springs 23 shall be offset, while the component forces in direction X shall be superimposed in the same direction; at this moment, the reset force in direction X provided by the U-shaped elastic part 25 shall be opposite to the component force of the spiral spring 23 in the direction X, that is, the component force offered by the spiral spring 23 in the direction X is opposite to the direction of the reset force of the U-shaped elastic part 25 during movement, namely, the negative rigidity ⁇ K 1 in direction X is offered by the spiral spring 23 .
  • the spiral springs 23 offers the negative rigidity ⁇ K 1 in direction X
  • the U-shaped elastic part 25 offers the positive rigidity +K 2 in direction X
  • the requirement to the rigidity value of the spring system shall not be changed when the requirements to quality and frequency of the vibrator 21 are not kept still, that is, the reduced rigidity value as a result of the spiral spring 23 having the negative rigidity can be offset by increasing the rigidity of the U-shaped elastic part 25 in the direction X, namely, the performance can be kept still by increasing the +K 2 of the U-shaped elastic part 25 in the direction X.
  • the rigidity value in direction YZ shall be increased correspondingly at the same time when the rigidity value in direction X is increased because the ratio confirmed of the rigidity value in direction YZ to the rigidity value in direction X is determined by the design of the U-shaped elastic part 25 ; therefore, the stability of the vibrator 21 can be increased;
  • the rigidity value in direction YZ shall be increased corresponding when the rigidity value of the U-shaped elastic part 25 is increased in order to ensure the performance is not changed in terms of the design of the spiral spring 23 with negative rigidity ⁇ K 1 increased; thus, the stability during movement can be increased.
  • the beneficial effects of the linear vibration motor provided by the invention are as follows: the negative rigidity is offered by assembling two pre-compressed springs which are arranged symmetrically; the rigidity value of the elastic part in direction X is required to increase in order to ensure the frequency of the vibrator, that is, the rigidity value of the elastic part in direction X should be increased in order to ensure the performance will not be changed. Moreover, the stability of the vibrator can be increased if the rigidity value in direction YZ is increased correspondingly when the rigidity value in direction X is increased because the ratio confirmed of the rigidity value in direction YZ to the rigidity value in direction X is determined by the design of the elastic part.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)
US15/236,669 2015-10-20 2016-08-15 Linear vibration motor Expired - Fee Related US10170965B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CN201510685476 2015-10-20
CN201510685476.8 2015-10-20
CN201510685476.8A CN105226908B (zh) 2015-10-20 2015-10-20 直线振动电机

Publications (2)

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US20170110947A1 US20170110947A1 (en) 2017-04-20
US10170965B2 true US10170965B2 (en) 2019-01-01

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US15/236,669 Expired - Fee Related US10170965B2 (en) 2015-10-20 2016-08-15 Linear vibration motor

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US (1) US10170965B2 (zh)
JP (1) JP6211650B2 (zh)
CN (1) CN105226908B (zh)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106026603B (zh) * 2016-06-06 2018-10-26 歌尔股份有限公司 一种线性振动马达
JP6692242B2 (ja) * 2016-07-25 2020-05-13 日本電産コパル株式会社 振動モータ
CN108233661A (zh) * 2018-01-03 2018-06-29 瑞声科技（南京）有限公司 振动电机
CN108199555A (zh) * 2018-01-03 2018-06-22 瑞声科技（南京）有限公司 振动电机
CN207968280U (zh) * 2018-02-11 2018-10-12 瑞声科技(新加坡)有限公司 线性振动电机
WO2021007805A1 (zh) * 2019-07-17 2021-01-21 瑞声声学科技(深圳)有限公司 线性振动马达
KR102316854B1 (ko) * 2021-01-26 2021-10-25 에이유에스피코리아 주식회사 수평 리니어 진동모터
CN214626753U (zh) * 2021-03-26 2021-11-05 瑞声光电科技(常州)有限公司 一种新型线性振动马达
US11831215B2 (en) * 2021-05-06 2023-11-28 Aac Microtech (Changzhou) Co., Ltd. Linear vibration motor

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7288863B2 (en) * 2003-07-09 2007-10-30 Bruan Gmbh Electric appliances having electric motors for driving oscillatory elements
US20160013710A1 (en) * 2014-07-09 2016-01-14 AAC Technologies Pte. Ltd. Linear vibration motor

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003024871A (ja) * 2001-07-13 2003-01-28 Nidec Copal Corp 振動発生器
KR100992264B1 (ko) * 2009-03-31 2010-11-05 삼성전기주식회사 리니어 진동 모터
CN201967123U (zh) * 2011-01-07 2011-09-07 瑞声光电科技(常州)有限公司 电声换能器
KR101969438B1 (ko) * 2012-11-12 2019-04-16 주식회사 엠플러스 선형진동모터
CN203562924U (zh) * 2013-12-04 2014-04-23 金龙机电股份有限公司 一种水平振动线性电机
CN204392054U (zh) * 2014-12-23 2015-06-10 瑞声光电科技(常州)有限公司 振动电机

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7288863B2 (en) * 2003-07-09 2007-10-30 Bruan Gmbh Electric appliances having electric motors for driving oscillatory elements
US20160013710A1 (en) * 2014-07-09 2016-01-14 AAC Technologies Pte. Ltd. Linear vibration motor

Also Published As

Publication number Publication date
JP2017079579A (ja) 2017-04-27
US20170110947A1 (en) 2017-04-20
JP6211650B2 (ja) 2017-10-11
CN105226908B (zh) 2019-03-22
CN105226908A (zh) 2016-01-06

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